Dear there can be many reasons -> Faulty fan that can fail to cool your machine.> Faulty power supply.> It might happen your the power plug in from the case's power switch hooked up to the wrong pins of the motherboard.> You can if you are confident have a look on those parts and fix those pin again or better to look for a service center.

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Some evaporator fans are controlled by a door switch that prevents fan from running while door is open. Switch is usually located in the area near door front and is either a push button or rocker type. If no switch there could be a control board that is defective. Those refrigerators that have a main mother board control system run all components through that mother board. Hard to tell exactly with out a brand and model number.

Could be a grounding issue. Remove the mother board from the case, and place on a piece of cardboard. Plug in the power supply, memory, monitor and power switch if it will reach (if not then you will need to short the jumper were the power switch plugs in with a small screw driver). Once set up, power on the mother board, you should get a no hard drive error, since we did not plug it in. If this does work, you will need to go the hardware store and pick up some rubber or paper washer to place between the mother board and the case.

just a thought have you checked that its not shorting out on the case? when you installed the motherboard did you put in the spacers?
if you have then i would suspect the psu check that the fan it running when you switch it on

that would work if you want a costly bill. Try this before dishing out cash, the problem is the switch that tells the board to turn on and of is bad and a cheep quick fix is to open the back of your TV(#15) (unplugged of course)and remove the hex(#10) screws to the mother board look under TV tube and you will see the switch board,remove both hex screws(#10) and pull the switch board out,follow black cord to mother board and pull cord out of its port. know find the word KEY also #2 on the switch board, should be the red wire. cut this wire and be sure there isn't any bare wire showing at your cut, a piece of black tape will help this. reinstall the switch board and mother board and back of TV . you should be all good to go

Heat sink switches? I have to assume that you're talking about a dead mother board but the fans and the LED on the mother board are OK? This is a classic eMachines problem. Their power supplies glitch and take out the mother board sometimes the power supply goes bad too.